If you're looking to clear out a few friends or find some empty seats at the movie theater, there's no better tactic than bringing up flat earth theory.
It is the idea that the planet we live on isn't as round and ball-like as it may seem from photos, TV, film, and numerous other places. It's actually a flat world that is surrounded by Antarctica as a Game Of Thrones style ice wall keeping the disc earth together.
There's a lot more than that and people have devoted their lives to it, so we're not going to cover everything. But there is an interesting new theory to bite into.